I have precisely same problem too, in some MKV with DTS audio.
And I have the ultra version.
The only thing that it is possible while to make, rename MKV in AVI, only I rename and MKV in which is DTS, starts to play back track DTS...
And I install for play MKV, Haali Media Splitter v1.9.355.21 and AC3Filter v1.63b.
This message was edited 3 times. Last update was at Feb 15. 2010 15:14